JPH0611021U - Uninterruptible power system - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the safety of the uninterruptible power supply at the start of re-power supply. [Composition] Commercial AC power is input to supply power to the central processing unit 20, and when a power failure of the commercial AC power AC is detected, power supply is started by a built-in battery and a shutdown command is issued, and when the shutdown end is received, power supply is stopped. In the uninterruptible power supply UPS that starts re-feeding when the commercial AC power AC is restored, when the power-supply stop signal is received, the storage unit 134 that stores the cause of the power-supply stop signal is referred to An uninterruptible power supply comprising a timer control block 13 for starting power supply after a lapse of a fixed time only when the cause is a power failure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an uninterruptible power supply device that supplies electric power to a central processing unit, and more specifically, to improve re-feeding operation when power is restored after a commercial power supply fails.

[0002]

[Prior art]

 Generally, an uninterruptible power supply is connected to a commercial power source to supply power to a load such as a central processing unit.However, when the commercial power supply fails, files in the central processing unit are destroyed. To prevent this, the power supply to the central processing unit is immediately continued by the backup of the built-in battery when the power failure of the commercial power supply is detected. In particular, for uninterruptible power supplies that can send and receive commands to and from the central processing unit, power supply is stopped and power is supplied again according to the following procedure. That is, when the uninterruptible power supply detects a power failure of the commercial power supply, it immediately continues to supply power from the built-in battery and sends a shutdown command to the central processing unit. When the shutdown processing is completed, the central processing unit sends a shutdown end notification signal to the uninterruptible power supply, which causes the uninterruptible power supply to stop supplying power. After that, when the commercial power is restored, the uninterruptible power supply immediately starts supplying power, and the central processing unit restarts.

FIG. 4 is a general configuration block diagram showing the conventional uninterruptible power supply UPS10 and the central processing unit CPU20 as described above. In this figure, the UPS 10 receives a commercial AC signal AC in a power supply circuit 11, and a power failure / power recovery detection circuit 12 detects a power failure or power recovery of the AC signal AC. When the power failure recovery detection circuit 12 detects a power failure, a power failure detection signal is transmitted to the control circuit 13. In response to the power failure detection signal, the control circuit 13 gives an internal battery-on signal to the power supply circuit 11 to continue power supply to the CPU 20 side, and at the same time, outputs a shut down command (shutdown command) to the CPU 20 as a serial signal to the I / O circuit. It is sent to the CPU 20 side via 15. When the shutdown process ends, the CPU 20 returns a shutdown end signal to the control circuit 13 via the I / O circuit 15, and when the control circuit 13 receives this, it sends a power supply off signal to the AC switch 14. The AC switch 14 is turned off, and the UPS 10 stops the power supply to the CPU 20.

After that, the control circuit 13 monitors the signal from the power failure recovery detection circuit 12, and when it detects that the commercial AC signal AC is recovered, immediately sends a battery off signal to the power supply circuit 11 for commercial operation. While switching to the AC signal, the power supply ON signal is transmitted to the AC switch 14. As a result, power is supplied from the AC switch 14 to the CPU 20, and the CPU 20 restarts.

[0005]

[Problems to be solved by the device]

 In the conventional uninterruptible power supply UPS as described above, when the commercial AC signal AC loses power and restores power, the central processing unit CPU restarts power immediately when the power is restored. There is. However, in the case of the conventional device as described above, when there is a continuous power failure, that is, when the power is restored after the power failure and the UPS re-powers, and the power failure occurs again shortly after, the UPS returns to the battery again. • This battery backup must be continued until the backup is started and the utility power is restored or the central processing unit finishes shutting down. If such a situation is repeated, there is a problem that the UPS battery is over-discharged and the life is shortened, or the backup cannot be performed until the central processing unit is shut down and the file is destroyed. Here, the continuous power failure is a situation in which the first power failure occurs and the operation of the commercial AC signal AC is still unstable. An object of the present invention is to solve such a problem of the conventional technique, and an object thereof is to improve the safety at the start of re-power supply of UPS.

[0006]

[Means for Solving the Problems]

 The present invention, which achieves such an object, inputs commercial AC power to supply power to a central processing unit, and when a power failure of the commercial AC power is detected, power supply is started by a built-in battery and a shutdown command is issued to terminate shutdown. In the uninterruptible power supply device that stops the power supply when receiving the power supply and restarts the power supply when the commercial AC power is restored, the storage means that stores the cause when the power supply stop signal is received, and the storage device. The uninterruptible power supply device is provided with a timer control block that starts power supply after a lapse of a fixed time only when the cause of the power supply stop signal is a power failure with reference to the means.

[0007]

[Action]

 The uninterruptible power supply of the present invention, when a power supply stop signal is given, stores the cause of the power supply stop in the storage means, and activates the timer only when the cause of the power supply stop is a power failure to restore power. Delay the power supply.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. The device of the present invention has an overall configuration similar to that of the conventional device shown in FIG. 4, but the configuration of the control circuit 13 is different, and its hardware configuration block is shown in FIG. In FIG. 1, the control circuit 13 has a microprocessor 131, and stops the power supply by a power supply on / off operation switch of the UPS via a bus B, an input port 132 for receiving a power supply start signal, and a power failure recovery detection circuit 12 Controls the operation of the input port 133 that receives the power failure detection signal and the power recovery detection signal, the nonvolatile memory 134 that stores the power supply start cause, the power supply stop cause, and the like when the power supply start signal or the power supply stop signal is received, and the microprocessor 131 It is composed of a memory 135 for holding programs and the like, and an output port 136 for transmitting a power supply on / off signal to the AC switch 14 which actually turns on / off the power supply.

The above is the hardware configuration of the present invention. The block diagram of FIG. 2 conceptually summarizes this configuration. That is, the control circuit 13 functionally corresponds to the timer control block TC, receives the power supply stop signal, notifies the nonvolatile memory 134 of the cause of the power supply stop, and writes it. When the power supply stop signal is received and the cause of the power supply stop is a power failure, the timer installed inside is activated and waits for a certain period of time. Then, after a lapse of a certain period of time, the power supply ON signal is transmitted to the AC switch 14 to start power supply to the central processing unit CPU 20 side. Actually, the above timer control unit TC is realized by a program that controls the microprocessor 131.

The overall operation of the device of the present invention thus constructed will be described with reference to the flowchart of FIG. First, when the microprocessor 131 receives the power supply stop signal via the input port 132, it investigates the cause of the power supply stop, and if the power stop / recovery detection circuit 12 supplies the power stop signal, the power supply is stopped. The cause of the stop is a power failure and the fact is written in the nonvolatile memory 134. Then, the power supply off signal is transmitted from the output port 136 to the AC switch 15, and the power supply to the central processing unit CPU 20 is stopped.

After the power supply stop operation, when the microprocessor 131 receives the power recovery signal or the power supply start signal via the input port 132 or the input port 133, the microprocessor 131 reads the current power supply stop cause from the non-volatile memory 134 to check. As a result, if the current power outage is not caused by a power outage, power supply will be started immediately. On the other hand, if the current power supply is stopped due to a power failure, the internal timer is started and the power supply is kept stopped until the set time elapses. After this set time has elapsed, the power supply ON signal is transmitted from the output port 136 to the AC switch 15. If a power failure occurs again within the set time of this timer, the internal timer is also started from the time when the power is restored, and after the set time elapses, power is turned on from the output port 136 to the AC switch 14. Send a signal.

In this way, according to the device of the present invention, when the power supply stop signal is received, the cause is written in the memory, and if the cause is a power failure, a power supply start signal is generated after a certain period of time. To do. For this reason, an unstable period such as continuous power failure in which commercial AC signal power failure, power recovery, power failure, and power recovery are repeated until the commercial AC signal power failure occurs and power is restored as before. Can be avoided.

[0013]

[Effect of device]

 As described above, according to the present invention, when the uninterruptible power supply unit temporarily loses power and restores power, power is supplied to the central processing unit after the timer setting time elapses. Even if power is restored, commercial power can be stabilized before power can be resumed, frequent battery backups due to continuous power outages can be prevented, and uninterruptible power supply over discharge can drain the battery or cause this. It is possible to prevent file destruction in the central processing unit.

[Brief description of drawings]

FIG. 1 is a hardware configuration diagram of an uninterruptible power supply according to the present invention.

FIG. 2 is a schematic diagram showing the main blocks of the device of the present invention.

FIG. 3 is a flowchart showing the operation of the device of the present invention.

FIG. 4 is an overall configuration diagram of a conventional uninterruptible power supply.

[Explanation of symbols]

 10 Uninterruptible Power Supply 11 Power Supply Circuit 12 Power Failure Recovery Detection Circuit 13 Control Circuit 131 Microprocessor 132 Input Port 133 Input Port 134 Nonvolatile Memory 135 Memory 136 Output Port 14 AC Switch 15 I / O Circuit 20 Central Processing Unit CPU B Bus

Claims (1)

[Scope of utility model registration request] 1. When commercial AC power is input to supply electric power to a central processing unit, and when a power failure of the commercial AC power is detected, power supply is started by a built-in battery, and a shutdown command is issued to stop power supply when a shutdown end is received. However, in the uninterruptible power supply device that starts re-feeding when the commercial AC power is restored, a storage unit that stores the cause when a power supply stop signal is received, and the power supply stop signal with reference to the storage unit. An uninterruptible power supply device, which is provided with a timer control block that starts power supply after a lapse of a certain time only when the cause of the occurrence is a power failure.